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Old 20th December 2003, 05:34 PM   #1
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Default What to do with 4 12inch woofers?

What are the options for a good project with the following specifications? I have four of them in hand. At the moment I am doing a open baffle 2 way Jordan with Jx53 and Jx150 with a ribbon super tweeter. Or should I sell them off instead?

Power==175W RMS
PEAK==350WATT
Imp==4 ohm
RDC==2.8 ohm
Fs==25Hz
Qes==0.62
Qms==2.9
Qts==0.51
Vas==248L(8.75cu.ft.)
Xmas==+/-6mm(0.24)
Travel==1.1
No%==0.627
BI=6.8TM
Mms==64G
Sd sq.M.==0.0531
MAGNET==56oz
SIZE==12

Features
2" 2 layer voice-coil on aluminum bobbin
chrome ion deposited polypropylene cone with stress relief rings
Rubber surround

All the spec numbers means nothing to me at all, no clue!
Regards,
Chris
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Old 20th December 2003, 05:47 PM   #2
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Well, they sound like pretty decent drivers, good enough for a pair of push-push dipole subs....

BUT I think you'll have trouble integrating them with your JX150, which puts out pretty good bass in the Jordan factory alignments. I think you'll be happier with a setup where the JX150 is your LF driver.
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Old 20th December 2003, 06:28 PM   #3
sreten is offline sreten  United Kingdom
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Quote:
JX150, which puts out pretty good bass in the Jordan factory alignments.
On an open baffle ?


They sound like "free air" car drivers. Even in isobaric configuration
you'd need a sealed box of 4 cu for each pair.

Pretty good drivers for stereo open baffle subs though,
but this can get very complicated, see Linkwitz Labs.

sreten.
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Old 20th December 2003, 08:58 PM   #4
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Quote:
On an open baffle ?
My statement is still correct; Jordan does not have an open baffle factory alignment for the JX150.

http://www.ejjordan.co.uk/systems_frameset2.htm
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Old 20th December 2003, 09:19 PM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by leadbelly


My statement is still correct; Jordan does not have an open baffle factory alignment for the JX150.

http://www.ejjordan.co.uk/systems_frameset2.htm
OK, I'll rise to the bait, correct but totally pointless in context.

sreten.
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Old 21st December 2003, 12:35 AM   #6
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I think the output of 4 x 12" drivers with such a small xmax will be marginal. Sealed or vented they will have reasonable output. You need a lot of displacement to get any real output of a dipole!!!
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Old 21st December 2003, 12:46 PM   #7
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Quote:
Originally posted by paulspencer
I think the output of 4 x 12" drivers with such a small xmax will be marginal. Sealed or vented they will have reasonable output. You need a lot of displacement to get any real output of a dipole!!!


Displacement means diameter of the 12" or horizontal movement of the diaphragm along X-axis?
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Old 21st December 2003, 01:09 PM   #8
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mount them in the floor... I did it with a single 10inch driver, and the bass was the best.. lol for a $35 10inch woofer with 3mm x-max..
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Old 21st December 2003, 01:45 PM   #9
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If I want to use it in the basement that means I have to dig a hole in the concrete foundation in order to mount them in the floor. That may be too much work to smash thru the foundation. What about paper/cardboard tubes? Any suggestions?
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Old 21st December 2003, 02:50 PM   #10
sreten is offline sreten  United Kingdom
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If you use cardboard tubes you need two around 6 feet tall.

Use a pair of drivers in clamshell / isobaric configuration per tube.

Stuff well and you'll get a Q of around 0.7 at 35Hz.

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